Abstract
We examined the influence of elevated CO2 concentration on denitrifier enzyme activity in wheat rhizoplanes by using controlled environments and solution culture techniques. Potential denitrification activity was from 3 to 24 times higher on roots that were grown under an elevated CO2 concentration of 1,000 micromoles of CO2 mol-1 than on roots grown under ambient levels of CO2. Nitrogen loss, as determined by a nitrogen mass balance, increased with elevated CO2 levels in the shoot environment and with a high NO3- concentration in the rooting zone. These results indicated that aerial CO2 concentration can play a role in rhizosphere denitrifier activity.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Ammonia / metabolism
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Carbon Dioxide / metabolism
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Carbon Dioxide / pharmacology*
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Culture Media
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Dose-Response Relationship, Drug
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Environment, Controlled
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Fertilizers
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Hydroponics
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Nitrates / pharmacology*
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Nitrogen / metabolism
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Plant Roots / drug effects*
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Plant Roots / growth & development
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Plant Roots / metabolism
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Plant Roots / microbiology*
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Plant Shoots / drug effects
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Plant Shoots / growth & development
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Plant Shoots / metabolism
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Soil Microbiology
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Triticum / drug effects*
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Triticum / growth & development
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Triticum / metabolism
Substances
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Culture Media
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Fertilizers
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Nitrates
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Carbon Dioxide
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Ammonia
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Nitrogen